<template>
  <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
    <h3>{{ isCollapse ? '后台' : '通用后台管理系统' }}</h3>
    <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>
    <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)" index="subItem.path">{{subItem.label}}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>
  
  <style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100vh;
  border-right: none;
  h3 {
    color: #fff;
    text-align: center;
    line-height: 48px;
  }
}
</style>
  
<script>
import Cookie from 'js-cookie'
export default {
  data () {
    return {}
  },
  methods: {
    handleOpen (key, keyPath) {
      console.log(key, keyPath)
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath)
    },
    clickMenu (item) {
      console.log('=====',item)
      if (this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))) {
        this.$router.push(item.path)
      }
      this.$store.commit('selectMenu',item)

    }
  },
  computed: {
    // 数据过滤
    // 没有子菜单
    noChildren () {
      return this.menuData.filter((item) => !item.children)
    },
    // 有子菜单
    hasChildren () {
      return this.menuData.filter((item) => item.children)
    },
    menuData(){
      return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
      // 判断当前数据，如果缓存中没有就从当前store获取
    },
    isCollapse () {
      return this.$store.state.tab.isCollapse
    }
  }
}
</script>